What To Do If An Insulator Core Is Pulled Out? A Detailed Explanation Of The Anti-slip Principle Of Wedge-type Fittings.

One failure mode in high-voltage transmission lines is that the internal fiber-reinforced plastic rod comes loose from the end joint. This mechanical failure compromises grid reliability. Resolving this challenge requires robust mechanical anchoring methods within dead end insulators to withstand continuous tensile loads.

Mechanical Mechanism of Wedge-Type End Fittings

Wedge-type hardware eliminates slippage by converting axial tensile force into a uniform radial clamping pressure. Unlike crimped designs that risk uneven stress distribution, the wedge system utilizes a tapered internal geometry to secure the core.

The Parallel Contraction Principle

When a composite suspension insulator experiences high mechanical tension, the internal wedge components slide along the tapered housing. This movement triggers a parallel contraction, applying a symmetrical compressive force around the entire circumference of the rod.

• Uniform Pressure: Eliminates localized stress concentration points on the polymer suspension insulator core.

• Zero Gap Maintenance: Continuous contact prevents moisture ingress and micro-motions.

The Self-Tightening Effect

The defining feature of this suspension type insulator hardware is its self-tightening capability. As the external load on the dead end insulators increases, the wedge is pulled deeper into the conical sleeve, automatically amplifying the gripping force.

1. Load Application: Tensile force increases during environmental stress like heavy ice or wind.

2. Proportional Gripping: The radial clamping pressure rises in direct proportion to the tensile load.

3. Ultimate Retention: Mechanical failure occurs only when the tensile load exceeds the ultimate material strength, not from slippage.

Performance Analysis of Joint Mechanisms